Endorsed by Which?

KJM Windows and Conservatories

4.9

86 Reviews

Opening Hours
Today - 09:00–17:00
  • Monday 09:00–17:00
  • Tuesday 09:00–17:00
  • Wednesday 09:00–17:00
  • Thursday 09:00–17:00
  • Friday 09:00–17:00
  • Saturday 09:00–14:00
  • Sunday - Closed

Organisations and Awards

FEBRUARY 2024

About

KJM Windows and Conservatories an multiple award winning company were formed in 1983. Over the years KJM has become a well established and a reputable glazing company, which has gained the trust of thousands of home owners and businesses alike! To date we have installed over £90,000,000 of glazing products. Our diverse range of materials gives you the options that you require. We don't just sell PVCu, but offer timber and aluminium as well. This is backed up with a comprehensive 10 year warranty (insurance backed) that has a proven record. We have many accreditations, including G11, G13, G14 and G15 Installer of the year finalists, Glass and Glazing Federation (GGF) members, Hampshire Trading Standards approved and of course Which? Trusted Traders. Sales calls are free, without pressure and our pricing is competitive. There is no hype or special "buy one get one free" offers, just good honest pricing. Give us a try, you wont be disappointed.

What we do

  • Glaziers

    • Double glazing installation
    • Timber windows
    • Sash windows
    • Window consultants
    • Aluminium Windows
    • Double glazed units
    • Double glazing repair
    • Replacement window services and repairs
    • Stained glass
    • Triple Glazing
    • UPVC Windows
  • Conservatories

    • Hardwood conservatories and orangeries
    • Sun Lounge
  • Doors

    • Patio doors
    • Timber doors
    • Bi-fold doors
    • ​Aluminium doors
    • Composite doors
    • Front door
    • French doors
    • UPVC doors
    • Door repairs
    • Orangeries

Customer reviews

Why you can trust these reviews

All reviews are verified as being genuine and a true customer of this trader.

How can we be so sure?

100% of the reviews we publish have been through our stringent moderation process.

4.9
86 reviews
Customer Service
4.9
Quality
5.0
Value
4.9
Sort by
Secondary glazing on 18th century cottage next to railway line
Customer Service
Quality
Value
KJM replaced old secondary glazing in six windows in my old cottage. The work was done quickly and to a high standard. Three of the upstairs windows were done in high spec acoustic glass, and this has definitely helped to deaden the noise from the trains. The work was done in one day, and the windows were left extremely clean and tidy. There was some replastering work needed on the reveals where the old glazing came out, but this was anticipated as we wanted a wider gap between the windows and the secondary glazing to improve acoustic and thermal performance. KJM gave me a good price, were efficient, and I am very pleased with the job.
Customer in Somerset Posted on 14/01/2019 , work completed 21/12/2018
Another great install
Customer Service
Quality
Value
Thanks to Mark and his team of professional staff. I am pleased with the installation of windows and doors. Highly recommend Kjm windows conservatory anybody
Customer in Oxfordshire Posted on 08/08/2023 , work completed 20/01/2005
The trader replied (on 14/08/2023)
Thank you for taking the time to provide us with a review. It is a pleasure to continue doing business with you. Mark & all the team at KJM
Fantastic team at KJM - could not fault them!
Customer Service
Quality
Value
Couldn't be more pleased with this - 2 bays, 5 windows and French doors installed with great care and precision, and at a very fair price. All the team at KJM have been brilliant: informative, meticulous, careful, skilful, cheerful and friendly. It was a pleasure to have you around. Thanks to Paul for initial advice, Andy for surveying, Josh and Aiden for all your hard work and Emma for coordinating. Sorry we couldn't give you better weather! Next in line is the new front door!
Customer in Wiltshire Posted on 14/11/2023 , work completed 02/11/2023
The trader replied (on 22/11/2023)
Thank you so much for taking the time to provide KJM with a 5* review As both the MD and owner of the business, the eight words below make me so happy. Its is so good to see you also mention all the team at KJM from that started with sales, then the surveyor, Emma and then the fitters "Brilliant: informative, meticulous, careful, skilful, cheerful and friendly" Thank you again from Mark and all the team at KJM
KJM Window Install
Customer Service
Quality
Value
The team from KJM called this afternoon, at the agreed time, to install two windows and two secondary glazing units. They were very polite and introduced themselves prior to getting started. Once inside they were very conscious about any mess and cleaned up as they went. The installation went well, unfortunately one of the glass panels cracked while on site - but the team let me know and also called to order a replacement there and then, so that it can be rectified as soon as. Absolute cracking service, after something occurred. It was raining on the day of installation and one of the team took their shoes off when they came inside, very considerate, so that they minimised the mess. They also helped to replace the furniture after the install, which had been moved for access. Windows look fantastic; colour match to the paint work of the building is identical - so overall very happy indeed.
Customer in Hampshire Posted on 31/10/2023 , work completed 31/10/2023
The trader replied (on 06/11/2023)
Hello, thank you so much for your 5* review. After you mentioned the cracked glass, the line "Absolute cracking service" made me smile, I'm not sure if that was an intended pun or not? It's good to continue to hear that the fitters are considerate when working in customer's homes. Thank you again for the review, it's very much appreciated. Mark and all the team at KJM
Excellent work, finished on time.
Customer Service
Quality
Value
The workmen did an excellent job. I am delighted with the triple glazed windows and front door in my bungalow. The men were unfailingly pleasant and polite. As well as being extremely efficient with the work, they put cloths down straightaway and they vacuumed at the end of each day, leaving everything clean and tidy. They arrived at the time they said they would each day and could not have been more helpful. I was very grateful to have the window and door locks explained in detail and demonstrated. I live on my own as my husband died last September so it was good to have practical things explained. I was told exactly how much it would cost and paid in three stages - a deposit when I booked them, a middle amount when the work started and a final invoice.
Customer in Hampshire Posted on 12/04/2024 , work completed 11/04/2024
The trader replied (on 17/04/2024)
Good morning from all at KJM. Thank you for taking the time to give KJM a comprehensive 5* review. To see the words "unfailingly pleasant and polite" makes me so proud. I have just phoned the fitting team to thank them for their continued efforts at making KJM's customer service what it is today. We are all really sorry to hear about your loss and if we can help anyway in the future with other projects then dont hesitate to ask. We have an extensive network of suppliers and contacts who I would happily recommend. Mark and all the team at KJM.
New back door
Customer Service
Quality
Value
KJM have done a good job on our back door. They helped us choose which one would be suitable and then fitted it. Andy did a really neat job and it looks great. We would not hesitate to ask KJM to do further word on our house if required.
Customer in Hampshire Posted on 23/03/2024 , work completed 20/03/2024
The trader replied (on 26/03/2024)
Thank you for taking the time to provide us with a 5* Which review. It is very much appreciated. I am very happy that you would return to us as a customer. Thank you again Mark and all the team at KJM
Great double glazing company
Customer Service
Quality
Value
Kept in touch all the time from order to installation. Came when they said they would. Excellent workmanship and attention to detail Incredibly tidy and neat. Very courteous and respectful of things like plants around the windows Great products
Customer in Hampshire Posted on 04/03/2024 , work completed 01/03/2024
The trader replied (on 13/03/2024)
Thank you for taking the time to review KJM, it is very much appreciated. Key points for me that match the company ethos were words like "courteous, respectful, excellent workmanship and attention to detail" Thank you again for taking the time to review us. Mark and all the team at KJM.
Excellent service
Customer Service
Quality
Value
After being let down badly whilst with another large company my confidence of trying with another company was shattered.But KJM were amazing from start to the finish of completion of the instalation of my windows I could not have used a better company they were friendly helpful and absolutely nothing was too much trouble, there were no problems at all from start to finish and I will definately be using them again, and will be recommending to everyone I know 100 percent brilliant company and staff .
Customer in Hampshire Posted on 31/01/2024 , work completed 17/01/2024
The trader replied (on 14/02/2024)
Thank you for the 5* review. What can I say about "100 percent brilliant company and staff" and "I could not have used a better company they were friendly helpful and absolutely nothing was too much trouble" Music to my ears! Thank you again Mark and all the team at KJM
New front door and side windows
Customer Service
Quality
Value
Another professional job from KJM. We have just had a new Solidor front door fitted to our 1930's house. Firstly they gave us helpful advice on choosing the right door for our property and after a few visits to their showroom we made our decision on the door, glass and fixtures. The survey revealed the need for a steel lintel above the door and the subsequent building works were carried out beforehand causing minimum disruption and in keeping with the property. A very professional installation of the door and two side windows was carried out by the two fitters who kept everything very clean and tidy whilst they worked. This was the third time we have used KJM having previously had two bay windows and several other windows replaced by their team over the past four years. We are very pleased with all the works carried out by KJM, everyone in their team is helpful, polite and friendly and we would not hesitate to recommend this company.
Customer in Wiltshire Posted on 04/09/2024 , work completed 27/08/2024
The trader replied (on 10/09/2024)
Thank you so much for taking the time to provide a 5* review for KJM. I am really pleased that you continue to be a customer of KJM. The line "We are very pleased with all the works carried out by KJM, everyone in their team is helpful, polite and friendly" is what we strive for each and every day. Thank you again from Mark and all the team at KJM
Brilliant!
Customer Service
Quality
Value
Called KJM this morning regarding a broken door (not a KJM door). Attended my property very quickly and fixed the problem. Service was outstanding and professional . Great customer service, would highly recommend!
Customer in Hampshire Posted on 09/05/2025 , work completed 09/05/2025
The trader replied (on 28/05/2025)
Thank you for providing a glowing 5* review regarding our customer service. We are pleased that we could help. Mark and all the team at KJM
Install french doors
Customer Service
Quality
Value
I have found working with all of your staff a fantastic experience and your installation has made a huge difference to the refurbishment of our home. Please extend particular thanks to Anthony who had immense patience helping us to work out what we wanted and needed. When we come to doing a full replacement of the windows in a few years you will definitely be our first point of call.
Customer in Hampshire Posted on 03/02/2019 , work completed 23/01/2019
Brilliant work and price
Customer Service
Quality
Value
KJM recently installed triple glazed windows and doors very efficiently at the back and sides of the house. Very very pleased with the work completed, the total cost and the very friendly manner in which the whole matter was carried out and no pressure to complete the order. Thoroughly recommend KJM. Am now proceeding with getting the front of the house triple glazed. Many thanks once again
Customer in Hampshire Posted on 04/03/2019 , work completed 26/02/2019
New Front Door
Customer Service
Quality
Value
KJM replaced and fitted a new front door for us. The experience from beginning to end was impressive and we are very happy with the product. The door looks great and the workmanship carried out fitting the door is exceptional. The work was carried out at the agreed price and on an amicably agreed date. All dealings with the KJM staff have been nothing but helpful and we would have no hesitation in recommending them and no doubt will have work done by them in the future.
Customer in Hampshire Posted on 03/04/2019 , work completed 05/02/2019
Great service
Customer Service
Quality
Value
Arrived on time, very friendly and very, very tidy. Excellent finish to job i.e. edging to wall tiles & floor tiles.
Moya, Hampshire Posted on 08/08/2019 , work completed 08/08/2019
KGM gave excellent service from the initial meeting to discuss our requirements through to efficent installation and prompt problem solving
Customer Service
Quality
Value
Our requirement was to replace 4 double-glazed units in two 35-year-old large windows (one with 6 panes & the other with 3). We had 3 quotations and the KGM Sales Manager who visited our home was head and shoulders above the others in his technical knowledge. He recommended that we replace all the glass to avoid a visual difference between the new and old, and that we replace the aluminium frames because of the much better thermal properties of modern frames. It was agreed that we would retain the mahogany frames into which the aluminium frames were mounted. When it came to the installation and the first aluminium frame was removed an unforeseen problem came to light - the sides, top and bottom of the old frames were "stepped" whereas the new ones were flat and would not fit. The installers phoned the office and the MD and Sales Mgr were on site within 40 minutes. They were extremely apologetic and soon decided that either in-situ modification to the wooden frames was required or new frames. The carefully removed frame and glass were reinstalled. Within two days we were told that new mahogany frames, stained to match all the others in the house, would be supplied in 3-4 weeks. The installation was then completed in two days. Aidan and Carl worked efficiently, neatly cleanly and tidily. No touching up was needed inside and very little outside. I have no hesitation in recommending KGM for all aspects of their work but especially for their problem solving skills.
Customer in Hampshire Posted on 23/09/2019 , work completed 17/09/2019
Excellent double glazing firm
Customer Service
Quality
Value
The work was carried out very professionally. The team worked extremely hard in adverse weather conditions. Very pleased with the final product. Have used this firm before and have found their work to be top quality and competitively priced. Also any guarantee work, where necessary, has been carried out promptly and without quibble. Will have no hesitation using them again.
Customer in Hampshire Posted on 22/09/2020 , work completed 19/08/2020
Fast, expert, fair
Customer Service
Quality
Value
We had a problem with a PVC replacement door not locking. We asked locally and got recommendations for KJM. Called late afternoon to speak with the owner and received a promise for a visit the next morning. Mark turned up at 08:00, and by 08.10 had the door working again. Didn't stop there though. Spent the next 15 minutes adjusting everything and anything until the door fitted and worked better than at any time since it was fitted. After all that, refused to take a payment since he'd been at another appointment a short drive away. I can't recommend this group and it's boss highly enough.
Customer in Hampshire Posted on 30/09/2021 , work completed 30/09/2021
The trader replied (on 10/03/2022)
Little things can make a customer happy, I'm glad I managed that. I hope all is well at your end? Our conversation I will remember forever. You take care. Mark
Which? Local Review
Customer Service
Quality
Value
KJM fitted French Windows for us. They were quick, efficient, good value and professional. The quote was fully detailed and the whole process was a pleasure. I will definitely use them again.
Ken-out-of-Bath Posted on 06/02/2013 , work completed 06/02/2013
Full house replacement windows
Customer Service
Quality
Value
KJM offer a fantastic high level of service & good value for money. Their team of fitters are second to none. They were extremely hardworking, professional, polite team. They were more than happy to answer any questions I had. I can honestly say that the guys were meticulous with cleaning up at the end of each day. I would strongly recommend KJM and have already recommended them to my neighbors. Keep up the good work KJM.
ollycush Posted on 18/02/2016 , work completed 18/02/2016
Very professional, friendly, high standards and tidy
Customer Service
Quality
Value
I had windows and front door fitted. The workmanship was excellent and exceeded my expectations. The people on site were great, friendly, efficient, very hard working, great communicators and extremely helpful. I am very pleased with the end result.
Tina in Hampshire Posted on 24/03/2022 , work completed 24/03/2022
The trader replied (on 25/03/2022)
Tina, thank you for taking the time to provide us with a Which? review, it is very much appreciated. It is a credit to all the KJM team that we exceeded expectations. Thank you again Mark MD KJM Group Ltd
Top quality and professional service
Customer Service
Quality
Value
Top-quality professional installation from the team at KJM. We recently had new Bi-fold doors installed during a new kitchen installation and the KJM team worked seamlessly with the other trades to complete the kitchen replacement. We have previously used KJM for the replacement of all of our windows, doors, conservatory, soffits and gutters in previous years and have always found them to be friendly, professional, helpful and reasonable in costs. We would not hesitate to recommend using Paul, Mark and the team at KJM.
Jon in Hampshire Posted on 14/06/2022 , work completed 26/05/2022
The trader replied (on 16/06/2022)
Jon, thank you so much for taking the time to provide such a nice review of your past KJM experiences. It is very much appreciated. Thank you Mark and all the team at KJM.
Fitting of bi-fold doors and front door
Customer Service
Quality
Value
We shopped around to find a suitable product from a reputable company and chose KJM. No hard sell, the salesman attended, and was very informative and helpful. As to the installation, Aidan, Josh and Will were very helpful and provided very good advice, were clean and tidy and provided an excellent finish. I would definitely recommend this company and its installers. All in all excellent quality and reasonable price
Customer in Hampshire Posted on 25/06/2022 , work completed 24/06/2022
Fitting of 18 UPVC Sliding Sash Windows
Customer Service
Quality
Value
This project was to replace aluminium sliding sash windows that had reached the end of their economic life. The job was made more difficult because the new windows are deeper than the originals. This meant cutting back the reveals in all windows including kitchen and bathrooms that were tiled. The sales process was a pleasant experience, without pressure. Because there were some technical queries it took some time to reach the order stage. Supply from the window manufacturer took some time because of, the now common, supply chain issues. The installation team of 2 persons, clearly demonstrated their wish to do a good job. Their attendance was timely. and they worked in a way that was always considerate of our needs, living in the house. They cleaned and cleared up well every evening. In my opinion they took considerable care to deliver a job that will please the customer. They succeeded.
Customer in Hampshire Posted on 05/07/2022 , work completed 17/12/2021
The trader replied (on 27/07/2022)
Thank you for taking the time to review KJM. I am pleased to see that apart from delivery times, you are pleased with the overall KJM offering. The supply chain, especially with this manufacturer, was especially slow. My apologies for this.
Head and shoulders above
Customer Service
Quality
Value
I have no hesitation in recommending KJM group. We needed two new fairly large picture windows with triple glazing to the 44mm std. The company is not local but was found by using the internet seeking information on triple glazing specs. The KJM website impressed. Installers closer to home had failed to provide quotes that met our needs. A senior manager called me and we discussed the work. He promptly visited with a sample of the suggested product. He measured the reveals and on same day emailed a comprehensive quote with all the spec. details. This was accepted. The installation experience was perfect. A cohesive and skilled team with excellent customer facing abilities. The frames each secured with fourteen Timco masonry screws and a first class finish inside and out. All debris removed and all left super clean and tidy. No damage to white/pale carpeting. It was a pleasure to have Josh and Charlie on site. The frames are Residence 7 with the pleasant flush casement design. Thickness is 75mm thus suitable in the replacement window context without cutting back in the reveals. Glass from the french company St Gobain. The internet played its part, we are most pleased to have found KJM.
Philip in Oxfordshire Posted on 27/07/2022 , work completed 22/07/2022
Fantastic service in every way
Customer Service
Quality
Value
I recently contacted KJM to get advice on replacing 6 ‘misted up’ decorative leaded double-glazed units at our house. They quickly sent a surveyor to us who checked the windows, took very detailed measurements and told us they would send a quote to us for the supply and fitting of the replacement units. The quote arrived quickly, was very reasonable, we paid the deposit and shortly afterwards they contacted us to confirm a fitting date. The fitters, Josh and Will, arrived on the agreed date and time and carried out the replacements quickly and efficiently. They were both really polite and good humoured, worked nonstop from the time they arrived and left the work areas immaculate before leaving. Our windows are a perfect match and look fantastic. This is customer service at its very best and I congratulate all of the KJM team in demonstrating how to deliver outstanding service. Well done to all and I will have no hesitation in recommending you to all our friends and family who might need such work doing in the future. Please in particular thank the two fitters who did the work, they were a real credit to your company.
Customer in Hampshire Posted on 16/01/2023 , work completed 20/10/2022
The trader replied (on 25/01/2023)
Good morning and many thanks for the 5* review. My favourtite line of your review is "This is customer service at its very best and I congratulate all of the KJM team in demonstrating how to deliver outstanding service." I will ensure this is passed on to the entire KJM team. Thank you again Mark MD KJM